A) the strain per unit length. B) the same as force. C) the ratio of the change in length to the original length. D) the applied force per cross-sectional area. E) the ratio of elastic modulus to strain. A) the strain per unit length. B) the same as force. C) the ratio of the change in length to the original length. D) the applied force per cross-sectional area. E) the ratio of elastic modulus to strain.

The two water reservoirs shown in the figure are open to the atmosphere,and the water has density 1000 kg/m3.The manometer contains incompressible oil with a density of 820 kg/m3.What is the difference in elevation h if the manometer reading m is 25.0 cm?

A) 0.045 m B) 0.025 m C) 0.065 m D) 0.115 m E) 0.205 m A) 0.045 m B) 0.025 m C) 0.065 m D) 0.115 m E) 0.205 m

A cable is 100 m long,has a cross-sectional area of 1.0 mm2,and is made of a material having a Young's modulus of 1.0 × 1011 N/m2.If a 1000-N force is applied to stretch the cable,how far does it stretch?

A) 0.0010 m B) 0.010 m C) 0.10 m D) 1.0 m E) 10 m A) 0.0010 m B) 0.010 m C) 0.10 m D) 1.0 m E) 10 m

A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water (of density 1000 kg/m3)while suspended from a harness.Her apparent weight is now 21.2 N.What is her density?

A) 1050 kg/m3 B) 1040 kg/m3 C) 1030 kg/m3 D) 960 kg/m3 E) 56.1 kg/m3 A) 1050 kg/m3 B) 1040 kg/m3 C) 1030 kg/m3 D) 960 kg/m3 E) 56.1 kg/m3

Exam 14: Fluids and Elasticity

Water flows through a pipe having a varying width.More water flows per second through the wide section than through the narrow section because there is more room for it to flow.

(True/False)

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Question 21

Tensile stress is

(Multiple Choice)

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Question 22

The two water reservoirs shown in the figure are open to the atmosphere,and the water has density 1000 kg/m³.The manometer contains incompressible oil with a density of 820 kg/m³.What is the difference in elevation h if the manometer reading m is 25.0 cm?

(Multiple Choice)

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Question 23

Consider a very small hole in the bottom of a tank in diameter filled with water to a height of Find the speed at which the water exits the tank through the hole.

(Multiple Choice)

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Question 24

A cubical box,5.00 cm on each side,is immersed in a fluid.The gauge pressure at the top surface of the box is 594 Pa and the gauge pressure on the bottom surface is 1133 Pa.What is the density of the fluid?

(Multiple Choice)

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Question 25

The graph in the figure shows the force on an object as a function of the elongation caused by that force.Which statement about this object is true?

(Multiple Choice)

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Question 26

In the figure,an open tank contains a layer of oil floating on top of a layer of water (of density 1000 kg/m³)that is 3.0 m thick,as shown.What must be the thickness of the oil layer if the gauge pressure at the bottom of the tank is to be The density of the oil is 510 kg/ .

(Short Answer)

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Question 27

Salt water is more dense than fresh water.A ship floats in both fresh water and salt water.Compared to the fresh water,the volume of salt water displaced by the ship is

(Multiple Choice)

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Question 28

A 12,000-N car is raised using a hydraulic lift,which consists of a U-tube with arms of unequal areas,filled with incompressible oil with a density of 800 kg/m³ and capped at both ends with tight-fitting pistons.The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm.The car rests on the piston on the wider arm of the U-tube.The pistons are initially at the same level.What is the force that must be applied to the smaller piston in order to lift the car after it has been raised 1.20 m? (For purposes of this problem,you can neglect the weight of the pistons.)

(Multiple Choice)

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Question 29

A rock is under water in a shallow lake.As the rock sinks deeper and deeper into water,the buoyant force on it

(Multiple Choice)

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Question 30

Water is flowing in a horizontal pipe of diameter d.If you want to change the diameter of this pipe so that the speed of the water would be half as great as it was,what should be the new diameter?

(Multiple Choice)

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Question 31

A cable is 100 m long,has a cross-sectional area of 1.0 mm²,and is made of a material having a Young's modulus of 1.0 × 10¹¹ N/m².If a 1000-N force is applied to stretch the cable,how far does it stretch?

(Multiple Choice)

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Question 32

Incompressible water flows out of a large reservoir through a pipe that opens to the atmosphere 5.70 m below the level of the water in the reservoir.What is the speed of the water as it comes out of the pipe?

(Multiple Choice)

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Question 33

A steel rod 55 cm long has a diameter of 30 cm.The compressive strength (the maximum stress it can support without breaking)of this steel is 500 × 10⁶ N/m².What is the compression force that would break the rod?

(Multiple Choice)

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Question 34

A hollow steel ball of diameter 3.0 m barely floats in water.What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm³ and that of water is 1000 kg/m³.

(Multiple Choice)

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Question 35

A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water (of density 1000 kg/m³)while suspended from a harness.Her apparent weight is now 21.2 N.What is her density?

(Multiple Choice)

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Question 36

A 12,000-N car is raised using a hydraulic lift,which consists of a U-tube with arms of unequal areas,filled with incompressible oil and capped at both ends with tight-fitting pistons.The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm.The car rests on the piston on the wider arm of the U-tube.The pistons are initially at the same level.What is the initial force that must be applied to the smaller piston in order to start lifting the car? (For purposes of this problem,you can neglect the weight of the pistons.)

(Multiple Choice)

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Question 37

A 1000-kg object hangs from the lower end of a steel rod 5.0 m long that is suspended vertically.The diameter of the rod is 0.80 cm and Young's modulus for the rod is 210,000 MN/m².What is the elongation of the rod due to this object?

(Multiple Choice)

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Question 38

As the speed of a moving fluid increases,the pressure in the fluid

(Multiple Choice)

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Question 39

A board that is 20.0 cm wide,5.00 cm thick,and 3.00 m long has a density 350 kg/m³.The board is floating partially submerged in water of density 1000 kg/m³.What fraction of the volume of the board is above the surface of the water?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 72

Exam 14: Fluids and Elasticity

Water flows through a pipe having a varying width.More water flows per second through the wide section than through the narrow section because there is more room for it to flow.

Tensile stress is

The two water reservoirs shown in the figure are open to the atmosphere,and the water has density 1000 kg/m3.The manometer contains incompressible oil with a density of 820 kg/m3.What is the difference in elevation h if the manometer reading m is 25.0 cm?

Consider a very small hole in the bottom of a tank in diameter filled with water to a height of Find the speed at which the water exits the tank through the hole.

A cubical box,5.00 cm on each side,is immersed in a fluid.The gauge pressure at the top surface of the box is 594 Pa and the gauge pressure on the bottom surface is 1133 Pa.What is the density of the fluid?

The graph in the figure shows the force on an object as a function of the elongation caused by that force.Which statement about this object is true?

In the figure,an open tank contains a layer of oil floating on top of a layer of water (of density 1000 kg/m3)that is 3.0 m thick,as shown.What must be the thickness of the oil layer if the gauge pressure at the bottom of the tank is to be The density of the oil is 510 kg/ .

Salt water is more dense than fresh water.A ship floats in both fresh water and salt water.Compared to the fresh water,the volume of salt water displaced by the ship is

A rock is under water in a shallow lake.As the rock sinks deeper and deeper into water,the buoyant force on it

Water is flowing in a horizontal pipe of diameter d.If you want to change the diameter of this pipe so that the speed of the water would be half as great as it was,what should be the new diameter?

A cable is 100 m long,has a cross-sectional area of 1.0 mm2,and is made of a material having a Young's modulus of 1.0 × 1011 N/m2.If a 1000-N force is applied to stretch the cable,how far does it stretch?

Incompressible water flows out of a large reservoir through a pipe that opens to the atmosphere 5.70 m below the level of the water in the reservoir.What is the speed of the water as it comes out of the pipe?

A steel rod 55 cm long has a diameter of 30 cm.The compressive strength (the maximum stress it can support without breaking)of this steel is 500 × 106 N/m2.What is the compression force that would break the rod?

A hollow steel ball of diameter 3.0 m barely floats in water.What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm3 and that of water is 1000 kg/m3.

A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water (of density 1000 kg/m3)while suspended from a harness.Her apparent weight is now 21.2 N.What is her density?

A 1000-kg object hangs from the lower end of a steel rod 5.0 m long that is suspended vertically.The diameter of the rod is 0.80 cm and Young's modulus for the rod is 210,000 MN/m2.What is the elongation of the rod due to this object?

As the speed of a moving fluid increases,the pressure in the fluid

A board that is 20.0 cm wide,5.00 cm thick,and 3.00 m long has a density 350 kg/m3.The board is floating partially submerged in water of density 1000 kg/m3.What fraction of the volume of the board is above the surface of the water?

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The two water reservoirs shown in the figure are open to the atmosphere,and the water has density 1000 kg/m³.The manometer contains incompressible oil with a density of 820 kg/m³.What is the difference in elevation h if the manometer reading m is 25.0 cm?

In the figure,an open tank contains a layer of oil floating on top of a layer of water (of density 1000 kg/m³)that is 3.0 m thick,as shown.What must be the thickness of the oil layer if the gauge pressure at the bottom of the tank is to be The density of the oil is 510 kg/ .

A cable is 100 m long,has a cross-sectional area of 1.0 mm²,and is made of a material having a Young's modulus of 1.0 × 10¹¹ N/m².If a 1000-N force is applied to stretch the cable,how far does it stretch?

A steel rod 55 cm long has a diameter of 30 cm.The compressive strength (the maximum stress it can support without breaking)of this steel is 500 × 10⁶ N/m².What is the compression force that would break the rod?

A hollow steel ball of diameter 3.0 m barely floats in water.What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm³ and that of water is 1000 kg/m³.

A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water (of density 1000 kg/m³)while suspended from a harness.Her apparent weight is now 21.2 N.What is her density?

A 1000-kg object hangs from the lower end of a steel rod 5.0 m long that is suspended vertically.The diameter of the rod is 0.80 cm and Young's modulus for the rod is 210,000 MN/m².What is the elongation of the rod due to this object?

A board that is 20.0 cm wide,5.00 cm thick,and 3.00 m long has a density 350 kg/m³.The board is floating partially submerged in water of density 1000 kg/m³.What fraction of the volume of the board is above the surface of the water?